Saw-filer



NJETERS. PHOTO-LITHOGRAPHER WASHINGTON D C.

UNTTED sTATEs PATENT oEEIoE.

JONATHAN SMITH, OF AGAVAM, MASSACHUSETTS.

SAW-FEDER.

Specification of Letters Patent No. 18,415, dated October 13, 1857.

To all 'whom t may concern:

Be it known that I, JONATHAN SMiTI-I, of Aga-wam, in the county of Hampden and State of Massachusetts, have invented a new and useful Apparatus for Filing the Teeth of Circular Saws; and I do hereby declare the following to be a full and particular description thereof, referring to the accompanying drawing, in which- Figure 1, is a side elevation of one side of the apparatus aiiXed. Fig. 2, is a front elevation. Fig. 3, is the opposite side of the apparatus in perspective.

My invention is for the purpose of guiding and directing the operation of filing circular saws so as to perform the same accurately and preserve the circular figure of the saw while giving to each toot-h the proper form and bevel and sharpening the same by the operation of hand filing.

Heretofore it has been found impossible to insure an exact form and bevel to a circular saw and so to file it by hand as to counteract the special tendencies thereof to run by tiling it so as to draw correctly and perfectly and it required the most skilful workmen to file with tolerable accuracy which could only be done by long experience. Vith my apparatus any common operative can file a saw perfectly with the assurance that the greatest accuracy of form will be maintained.

The construction is as follows: I form a U shaped piece of metal a the legs of which ft over the saw as seen in Figs. 1 and 2. Near the bend of this piece a two pieces of case hardened steel I) are afiixed to it one on each side and these pieces are made to the exact form the tooth is to be filed toas clearly represented and seen in Fig. 1,which represents one common form of tooth and the hardened steel gigs adapted thereto. These gigs as similar hardened steel patterns are called in other works for filing to, are so hard as not to be injured' by the tile and when in proper `position serve to guide the operation of the file. The bow a has two set screws c Z on one side and one e on the other as clearly seen in the figures, by which it is obvious it can be set upon the saw at any cross angle or straight across as desired by which the faceV ofneaclrtooth f can be filed so as to draw either way in cutting, or be made straight across without any draw.

Near the end of each of the legs of the bow a (which do not extend in to the center of the saw,) there is a set screw and upon either can be aixed an extension arm h having a long slit in it for regulating the length of the radial arm. arm l1 there is a center screw which fits into the center countersink in the end of the saw arbor and insures the distance of the gigs from the center of the arbor without regard to its bearings by this guide, and set, the gigs 7 can be swept all around the circle and afford a perfect guide and regulator, so that any inexperienced operative can tile a circular saw therewith with accuracy.

Having thus fully described my new apparatus for a saw setf what I claim as my invention, and for which I desire to secure Letters Patent is:

The combination and arrangements of the parts herein described consisting of the gigs regulating set and center guide in the manner and for the purposes specified.

y JONATHAN SMITH.

Witnesses IV. H. STANSBURY, T Hos. J. VELLS.

At the inner end of this l 

